Volcanic geological features and geochemical implications of Late Jurassic volcanoes in Duolun volcanic‐eruption basin of Inner Mongolia, China,Geological Journal

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Volcanic geological features and geochemical implications of Late Jurassic volcanoes in Duolun volcanic‐eruption basin of Inner Mongolia, China
Geological Journal ( IF 1.4 ) Pub Date : 2020-08-31 , DOI: 10.1002/gj.3973
Lingfei Han ₁ , Zhida Bai ₁

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Duolun volcanic‐eruption basin is part of the Mesozoic Tectono‐Magmatic Belt in the Great Khingan–Taihang Mountains. A lot of previous studies about this region have been made in geochronology, geomorphic genesis, magmatic origin, and Mesozoic Plate tectonic evolution. This article summarizes petrological features of volcanic rocks, lithofacies, volcanic sedimentary sequences, volcanic mechanism, and characters of volcanic eruptions in Duolun volcanic‐eruption basin. The volcanic sedimentary strata in this region are distributed along a series of NE and NNE tectonic belts, and accumulation thicknesses are controlled by volcanic edifices. We identified a total of seven volcanic edifices in Duolun volcanic‐eruption basin. For some typical volcanic edifices, we had studied their compositions, structures, geometries, and spatial distributions in detail, setting up regional volcanic tectonic framework. In the Manketouebo (J₃m) cycle, the intensity of the eruption was large, characterized by large broken volcanoes in the early stage, and small dome and cone volcanoes in the late stage. In the Baiyingaolao (J₃b) cycle, the strong volcanic activities manifested as Plinian‐type, are characterized by a large circular or nearly circular caldera at the top, moreover, late extrusive and intrusive domes in different cycles, ring faults and radial faults were also developed. Geochemical researches indicate that Duolun volcanic rocks have the basic characteristics of crust–mantle mixed source, and the tectonic environment for the Late Jurassic volcanic rocks is related to the collisional orogeny. Our work has great significance for further research on genesis of volcanic rocks, magma evolution, deep dynamics mechanism and their relationship between mineralization.

中文翻译：

内蒙古多伦火山喷发盆地晚侏罗世火山的火山地质特征及地球化学意义

多伦火山喷发盆地是大兴安岭-太行山中生代构造-岩浆带的一部分。关于该区域的许多先前研究已在地层年代学，地貌成因，岩浆成因和中生代板块构造演化中进行。本文总结了多伦火山喷发盆地的火山岩岩石特征，岩相，火山沉积序列，火山机制以及火山喷发特征。该区域的火山沉积地层沿一系列东北和北北东构造带分布，堆积厚度受火山岩的控制。我们在多伦火山喷发盆地共发现了七个火山构造。对于某些典型的火山建筑物，我们研究了它们的成分，结构，几何形状，详细的空间分布，建立区域火山构造框架。在Manketouebo（J₃ m）周期，喷发强度大，特征是早期破裂的火山较大，晚期为圆顶和圆锥形火山。在白影佬佬（J ₃b）循环，表现为强烈的火山活动，表现为Plinian型，其特征是顶部有大的圆形或近圆形火山口，此外，在不同的循环中还形成了晚期挤压和侵入性穹顶，还形成了环状断裂和放射状断裂。地球化学研究表明，多伦火山岩具有地壳幔混合源的基本特征，侏罗纪晚期火山岩的构造环境与碰撞造山作用有关。我们的工作对于进一步研究火山岩的成因，岩浆演化，深部动力学机制及其与成矿之间的关系具有重要意义。

更新日期：2020-08-31

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